Avoid online XAPK-to-APK converters for anything except testing small, OBB-free apps. Use dedicated installer apps locally.
Since an XAPK is essentially a renamed ZIP archive, you can often "convert" it manually using your device's built-in file manager: online convert xapk to apk
: This tool allows you to open and extract XAPK files directly in your browser without uploading them to a server, which is faster and more private. which is faster and more private.